nh0506 {bigmatch}

Smoking and homocysteine levels in NHANES 2005-2006.

Description

Bazzano et al. (2003) noted higher homocysteine levels in smokers than in nonsmokers. See also Pimentel et al. (2016) for a related analysis.

Usage

data("nh0506")

Format

A data frame with 2475 observations on the following 32 variables.

Row

a numeric vector

SEQN

NHANES id number

female

1 if female, 0 if male

age

age in years, >=20

black

1 if black, 0 otherwise

hispanic

1 if hispanic, 0 otherwise

education

Education

povertyr

Ratio of family income to the poverty level, capped at 5x

creactiveprotein

creactive protein

homocysteine

homocysteine

cotinine

cotinine in blood

cadmium

cadmium in blood

lead

lead in blood

bmi

Body mass index

cigs100life

1 if smoked more than 100 cigarettes in lifetime, 0 otherwise

smokenow

1 if smokes now, 0 otherwise

cigsdays30

Days smoked in last 30 days: 0 if never smoker, 30 if daily smoker

cigsperday30

Cigarettes smoked per day in last 30 days

tobacco5days

1 = used tobacco in the last 30 days, 0 otherwise

dailysmoker

1 = daily smoker, 0 = never smoker

neversmoker

1 = never smoker, 0 = daily smoker

z

1 if daily smoker, 0 if never smoker

propens

Estimated propensity score. The score was formed by logit regression of z on female, age, education, black, hispanic, povertyr, and bmi.

pstrat

Propensity score strata: (0,0.0733] (0.0733,0.131] (0.131,0.204] (0.204,0.33] (0.33,1]

age3

Age in 3 categories

ed3

Education in 3 categories

bmi3

BMI in 3 categories

pov2

Income above 2 times poverty, TRUE or FALSE

stf

A factor defining strata using female, age3, ed3, bmi3 pov2.

st

A numeric version of stf

stfp

A factor defining strata using stf and pstrat

stp

A numeric version of stp

Details

Data from NHANES 2005-2006 concerning homocysteine levels in daily smokers (z=1) and never smokers (z=0), aged 20 and older. Daily smokers smoked every day for the last 30 days, smoking an average of at least 10 cigarettes per day. Never smokers smoked fewer than 100 cigarettes in their lives, do not smoke now, and had no tobacco use in the previous 5 days.

Source

NHANES, the US National Health and Nutrition Examination Survey, 2005-2006.

References

Bazzano, L. A., He, J., Muntner, P., Vupputuri, S. and Whelton, P. K. (2003) Relationship between cigarette smoking and novel risk factors for cardiovascular disease in the United States. Annals of Internal Medicine, 138, 891-897.

Pimentel, S. D., Small, D. S. and Rosenbaum, P. R. (2016) Constructed second control groups and attenuation of unmeasured biases. Journal of the American Statistical Association, 111, 1157-1167.

Examples

data(nh0506)